<template>
  <div id = 'app'>
    <ul>
      <li v-for="(item, ind) in arr" :key='item' >
        <span>{{item}}</span>
        <button @click='del(ind)'>删除</button>
      </li>
    </ul>
    <button @click='add'>生成</button>
  </div>
</template>

<script>
export default {
data() {
  return{
   arr:[1,5,3]
  }
},
methods:{
  add() {
    this.arr.push(Math.floor(Math.random() *20))
  },
  del(index) {
    this.arr.splice(index,1)
  }
}
}
</script>

<style>

</style>